body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #064f4f;
  color: #333;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

header {
  background-color: #022f2f;
  color: white;
  padding: 30px;
  text-align: center;
  border-radius: 8px;
}

.em-construcao {
  color: #ffcc00;
}

section {
  padding: 20px;
  margin: 20px 0;
  background: white;
  border-radius: 8px;
}

h2 {
  border-bottom: 2px solid #ddd;
  padding-bottom: 5px;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin: 10px 0;
}

a {
  color: #0066cc;
  text-decoration: none;
}

footer {
  text-align: center;
  padding: 20px;
  background: #022f2f;
  color: white;
  border-radius: 8px;
}

@media (max-width: 600px) {
  .container {
    padding: 10px;
  }
}
.modo-aula {

  background: white;

  color: #222;

  padding: 24px;

  margin-bottom: 24px;

  border-radius: 12px;

  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.modo-aula h2 {

  margin-bottom: 12px;
}

.modo-aula p {

  margin-bottom: 16px;

  line-height: 1.5;
}

.modo-aula button {

  margin-top: 10px;

  margin-right: 10px;

  padding: 10px 18px;

  border: none;

  border-radius: 8px;

  cursor: pointer;

  font-size: 15px;

  transition: 0.2s;
}

.modo-aula button:hover {

  opacity: 0.9;
}

#btn-whatsapp {

  background: #25D366;

  color: white;
}

#btn-lousa,
#btn-lousa-reuniao {

  background: #4A90E2;

  color: white;
}

#btn-reuniao {

  background: #555;

  color: white;
}